Thanks Corby for adding the link, I should have provided the link in my earlier 
post.
The shipping concern is because Cesium or Caesium metal is highly reactive and 
very pyrophoric. In addition to igniting spontaneously in air, it reacts 
explosively with water even at low temperatures, but the small amount of actual 
Cesium in a Cesium standard as well as the hardening provided by that tube 
structure were important factors in it's exemption. I have recieved and shipped 
Cesium standards both in the USA and internaionally using the DOT exemption 
with no problem. I have a hard case designed specifically for that purpose 
which came with a Datum 4065C but is also perfect for the 5071A. It has all the 
critical warning and  exemption information in metal labels riveted to the 
outside of the case. I have seen these cases on eBay from time to time. Be 
aware there is a limit of how many Cesium standard can be shipped at once under 
the exemption, I think it is five. Not really a factor for most of us.
In any case I would use extreme caution if you ever open one for examination. 
To bad some industrious Time-Nut has not started a small business rebuilding 
Depleted Tubes. I have heard that failure often occurs when Cesium becomes 
mixed with contaminants and stuck to the enclosure walls, and there is a method 
to remove it. I know increasing the cell temp brings some standards back to 
life. And perhaps after heating and boiling  the Cesium off he walls the 
cleaner tube can then be returned to factory settings?
I am sure a number of you have far more expertise and have experimented with 
these ideas to determine whether there is any truth to these tall tails. If so 
I am sure I am not the only one that would enjoy hearing what you know, perhaps 
on a new thread. 
Thanks;
Thomas Knox



> To: time-nuts@febo.com
> Date: Sun, 22 Sep 2013 23:57:43 -0700
> From: cdel...@juno.com
> Subject: [time-nuts] HP5061B Beam Tubes
> 
> Per the following Symmetricom instructions, HP/Agilent/Symmetricom tubes
> or instruments with tubes are exempt from the Hazmat requirements if
> shipped within the USA. You still have to label them per the instructions
> and as stated you are considered "trained" If you understand the
> instructions.
>  
> http://www.symmetricom.com/media/files/downloads/product-datasheets/shipp
> ing_instructions.pdf
>  
>  
> One other source for tubes for your 5060A/5061A/5061B (and 5062C with a
> bit more mods) is to use FTS tubes removed from FTS 4050 and 4060 units.
> Some minor mechanical mods and you have to make adaptor cables but they
> are simple to make.
>  
> Corby
> 
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